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Finding the Fourth Proportional to 747.99, 1,123.61 and 611.37

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Solution

The fourth proportional to 747.99, 1,123.61 and 611.37 is: 918.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.99 : 1,123.61 = 611.37 : x
  2. Step 2: Convert to fraction form
    747.99/1,123.61 = 611.37/x
  3. Step 3: Cross multiply
    747.99x = 1,123.61 × 611.37
  4. Step 4: Simplify right side
    747.99x = 686,938.39
  5. Step 5: Solve for x
    x = 686,938.39/747.99
  6. Step 6: Final answer
    x = 918.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.